Signaling system.



11,13. GREGIBR. SIGNALING SYSTEM. APPLICATION FILED EAR. 16, 1904.

Patented Mar. 16, 1909;

k 2 SHEBTSSHEET 1.

- N. B. GRBGIER.

' SIGNALING SYSTEM. APPLIOATION FILED MAR.16, 1904.

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Z'e'izzewea;

UNITED STATES PATENT OFFICE.

NATHANIEL BANKS CREGIER, OF CHICAGO, ILLINOIS.

' SIGNALING sxs'rnm.

Specification of Letters Patent.

PatentedMarch 16, 1909.

Application med March 16, 1904. Serial No. 198,695.

To all whom it may concern:

Be it known that I, NATHANIEL BANKS Cnncrnma citizen of the UnitedStates, residing at Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements in SignalingSystems, of which the following is a specifics:-

tion.

This invention relates to an electrical signaling system andparticularly to a police signal system used for transmitting signalsbetween police patrolboxes and headquarters or acentr station; and ithas for its object, generally, to provide a central energy police telepone signal system designed to render the operation of signaling morespeedy and perfect of control and to avoid certain objections anddisadvantages in the systems heretofore employed.

I'Vith' the systems generally employed, it is in such systems are inseries with each other,

and that no adequate means have been pro.- vided' for detecting errorsinfalse reporting to which such systems are open. -To avoid this falsereporting and compel every patrolman to re ort only from the box in hisownv place the signalingapparatus ofterritory, each patrol ox in anindividual circuit, and in such circuit at the central station I rovidea signaling device of a suitable c aracter which will indicate to theoperator, either by reference to the number of the box or other means,the location of such box.

The 0 erator having been given the name of" the o 1081' reporting, isthereby enabled to determine immediately, of the trolled properterritory. y 7

A further and important object of'the invention is toprovide meansindependent of I from his knowledge patrolmans name and the beat a thetalking apparatus and over the same line for indicating to the operatorat the central station that the fatrol-wagon is desired, and the exact1008171011 of the box to which the patrol to be sent. Broadly,

such means may comprise suitable signaling him, whether he is on duty inis devices located at the central station and capable of being actuatedonly from the patrol box on the same circuit, and having:

associated therewith indicia for informing the operator of the-locationof the box sending in the call and to which the patrol wagon is to bedirected.

Another object of the invention is to provide a novel circuitarrangement particularly adapted to pohce telephone slgnal- .mg-systemsand capable of accomplishing certain new results in the transmission'ofsignals between the patrol box substation included in such circuit andthe central station.

' Another object of the invention is to dispense with the usual dropsand plugs and manually operated switches ordinarily employed with policetelephone signaling sys-' tems and to render the action of t devices atthe central station automatic in all particulars.

Other features of the invention and further objects and advantagesthereof, other than those already mentioned, will be hereinafterpointed; out in the accomie signaling practically panymg' description.The invention consists of the combination of parts and circuitarrangement now to be described, particularly designated in the e'lalmsand-illustrated in the accompanying drawings, in which.

Figure '1 is a diagrammatic view of the circuit, illustrating theapparatus at the central station and a patrol box and the connectionstherefor; Fig. 2 is a front elevation ofa central station switchboardfitted up with the signahappar'atus and details employed with myinvention, and showing.

m connection therewith twopatrol box substations, one. of which has theouter door open to disclose the arrangement of the telephone outfit,while the other box is shown with the outer door closed; and

Fig. 3 is ,a detail of the switch at the patrol box and which is desined to be controlled by the outer door of the box to alternately Iconnect and disconnect the call bell and answer back signal to and fromthe line.

The central station is provided with an operators telephone set T,ringing generator N, pilot light m alarm F, and battery 3 which: arecommon to all-the circuits, the

pilot light and alarm being actuated when ever a signal is sent in fromany patrol box of 119 the system,and-while in Fig.1, in order to conduceto cle'arness, I have shown the system with-circuits and connectionscomplate for only one patrol-box station, it is to e understood that thenumber may be increased indefinitely and that the- Wiring andconnections of all circuits are the same. Each patrol box P is providedwith a telephone set, which may be of the usual or any suitablecharacter, but which. preferably comprises the apparatus and circuitarrangement shown in Fig. 1. The line B leading from the central stationterminates at a binding post 1, from which leads a wire 3 connectingwith line 14 leading to transmitter 16, and from the latter a connection.17 leads to the primary winding .of the induction coil 15. From thelatter a con- .-nection 18 passes to the contact 13 of the with ordisconnect them from the line,

' leads a wire 1') 0'0 which means may consist of the usual ringing andlistening keys. Such keys, designated k, are mounted on the table orledge of the switchboard B in the usual manner, as

.shown in Fig. 2, and which, as they are of ordinary character, it hasnot been deemed necessary to show in Fig. 1. The lines A and B arenormally in'circuit with a relay designed, when energized, to close alocal circuit to actuate a signal to notify the operator of thelocation. of the box from which the signal emanates. In makingconnections from the substation to the central station the line A isconnected to the spring a of the ringing and listening key associatedwith the circuit and from the spring a a connection 0 leads from a0011-. tact a." with which the'spring a is normally,

in engagement. From a wires at and a lead to relay D. From the windingof this relay a line (1 connects with one side ofthe battery Y. The lineB is in electrical'connection. with the other spring I) of the ringingside of the listening key which is normally in engagement with a contactIf, from which. ected to wire I) leading to the otherside of thebattery.

The operator's telephone set T which is j common to all of the circuitsin the system,

comprises the usual receiver t, transmitter t", connected by wires tt,,with the batte Y, and connections i ft, provided wit contact points twith which the s rings i t, at the listening side of the key li engagewhen'the o erators key is thrown to the position to ridge in histelephone set with the line.

The circuit being normally open at the substation, when the receiver 11is removed from the hook the hook-switch 12 moves against the contact 13thereby closing thecircuit. This allows current from the bat tery Y fortalking b wire 5 contact wire 18, contact 13, wire 19, to terminal 2,

urposes to flow over lineline B, terminal 1, wire 3, Wire 14, throughthe transmitter 16, wire: 17, primary windlng of the induction coil 15,

and by line A ,to contact a ,"wires a a;*, a g and through relay D toline (1, thence to the opposite s1de of the battery Y. 'The closing avisual signal so located and arrange asto indicate to the operator at aglance the location of the box from which the receiver is removed fromthe hook 'In carrying out this feature of my invention provide at someconvenient position, as at S, on the front face of the receiving boardso as to be readily seen by the operator adiagram, plat or othersuitable medium whereby or map the operator may be informed when thereceiver of any its hook, of t e exact location of such box and knowwhen he learns the name of the officer reporting whether or not suchoflicer is reportin from the proper box. S ecifically of the circuitenergizes relay D which closes a' local circuit at the central stationto o crate. p

patrol box set is removed from such me ium comprises a map or p an ofthe locality served by the system, andsuch map, which is arranged in theorder ofthe streets of the territory covered thereby, may be providedwith the names of the streets, and'at each point corresponding with thelocation'of.

a patrol box is placed a signaling device which when actuated willindicate to the o erator at a glance the location of the box associatedtherewith. Such signal in the pres.- ent instance takes the form of anincandescent lamp m, the front of the-board being:

provided with anopening to show the illumination of the lamp. When nowthe relay'D is energized by closing the circuit at the patrol box, thearmature d of the relay D is attracted, closing the local circuit inwhichthe lamp m is included and the current from one side of the batterypasses through theline 11,

line (i tapped from the line 11, armature-d? which is moved against theanvil d. of'line (1 line d connected to .the armature (1 to the lampm,'then by wire (1? to-thefother side of the battery, therebyilluminating the 'lamp m. When the patrolmans receiver is hung up therelay D isof course deener ize'd and the local circuit being opened theampm is extinguished.

In order to indicate to the operator at a glance the particular ringingand listening kely associated with. any circuit avisual or ot e rsuitable signaling device is" provided and located in such position asto. denote the ringing and listening key to be mani ula'ted to throw the.operators set. on to t e line when a patrolman calls u To this end eachringing and listening ey, as shown in Fig. 2, has associated therewith alamp m which isso positioned as to show by its illumination the he ofthe circuit controlling the lamp. This lamp 111 may be arranged inmultiple with the lamp m and also cont-rolled by the energization of therelay D to illuminate the said lamp m For this urpose connection is madeby a wire (1 in e ectrical extension of the armature d and including thelamp m such wire connecting at its other end with the wire (1 It will beunderstOodirom this that when the relay is energized'in the mannerheretofore described, current is thrown through both the lamp mand thelamp m ofthat particular circuit, the former lam indicating from itslocation on the map the ocation of the box calling up the operator, andthe latter the articular listening key associated with su'c 1' line. Imay also provide an audible alarm to attract the attention ofthe-operator, and this alarm, which may consist of the bell F, isloeated at some convenient position on the receiving board, as shown inFig. 2, and'is actuated by an electromagnet fin aloeal circuitcontrolled by a relay R common to all the circuits of the system. Thisrelay R is in series with the lamps m, connection in the presentinstance being made in the line d eading from the said lamps to thebattery. When the relay R is energized the armature thereof is attractedagainst the contact 7, and current then flows by wire 7 connected to thewire d, from one side of the battery through armature r, wire j, throughthe electromagnetf", and by wire f to the other side of the battery.This energizes the magnet f and attracting its armature j, which 18provided with a cla per fl, gives the bell F a single tap. The iot lampm maybe included in the l-inej in series with the electromagnet f, andprovides a visual signal, and 45 this pilot light 13 preferably locatedon the receiving-board in such position as to be under the eyes of theoperator and serves to attract his attention to the map lam s m, forthis pilot light being. common to al the cir- 50 cuits it remainslighted so long as any of the map lamps m continue to burn. Thisprevents the operator from overlooking any call from a patrol box.

The lamp m indicates to the operator the key to bemanipulated to cutinhis telephone set in order to communicate with the officer calling up,and he then throws his key to talking positionbr so as to move thesprings t and-fagainst the anvils t This operation does not affect theline to the lamps owing to the permanent connections of the wires (1 bpast the sprin s z ,t", and'such lamps con tiuue to burn. he operator isof course assumed to know the names of the patrolmen and the territorypatrolled by them, and as soon as he receives the name of the oificerreporting he has only to referv to the lamp m corresponding with the boxfrom which the report is received to inform himself whether or not thepatrolman is at his proper station.

By means of the intercommunicating telephone sets the operator andpatrolman are enabled to report or send necessary instruc-' tions to andfrom headquarters. When the patrolman hangs up his receiver on its hookthe relay D is denergized, its armature dro ping back and therebyopening the local circuit and extinguishing the lamps m, m Relay R isalso denergized to open the local circuits controlled thereby an thusdecriergizes the magnet f so that it releases its armature to reset thebell mechanisms and also extinguishe's the pilot lamp m T he patrolsubstation'boxes may be of any suitable character or construction, butthey preferably comprise a rectangular box 25 provided with two doorshinged at opposite sides of the box so as to open in oppositedirections. T he chamber closed by the inner door 26 is designed tocontain most of the apparatus located at the substation, only such partsas are necessary in the ordinary use of the system being placed in frontof the door 26, such for instance as the receiver 11, which is supportedby the book 12 and is located in a recess or depression 27 on the frontof the door '26, the mouth piece of the transmitter 16, and certainother parts to be hereinafter mentioned.

Located at each patrol box is a generator 20, the handle 28 foroperating which extends in front of the door 26, so as to beinanipulated when the outer door 29 is open. This generator 20 may be ofthe alternating type, and is designed to be cut into and out of the mainline of the circuit by means of a switch mounted on the box and operatedby the outer door 29. This switch comprises a pair of contacts C, C,tied together and connected by a wire 22 with one side of the generator20, and with which a air of switch springs G, C, are designed to e movedinto engagement when theouter door 29 of the box is open. The springs C,C, are also tied together and a wire 4 leads from-them to the maincircuit, being shown connected to the wire 3. From the opposite side ofthe generator 20 a wire 21 leads through a ringer 23, and a line 24extends from the latter to a condenser 8 which is connected by wire 9 tothe wire 19 terminating at the terminal 2. The switehoperated by thedoor of the box is also provided with a pair of contacts C C, alsoconnected together and from the same a wire 5 leads to a-reeall bell 6,a connection 7 from the latter leading to line 24 connected, to thecondenser. T he hell 6 is designed to i be mounted inan exposedposition, and preferably upon the top of the patrol box, a ood 30 beingprovided to protect the same.

The switch at the patrol box, shown on a larger scale in Fig. 3,comprises a bracket h fixed to-the inner side of the door 26 by a nut72. threaded upon an apertured lug gojecting from'the bracket andextending t ough an opening in the door 26. Passingthrough an 9 aperturein the lug is a plunger 72. having a the generator 20 an actuate-d whenthe generator is manipulated. Located at convenient positions on theboard beveled portion k which is adapted to engage the ends of theswitch springs C, C, and move them out of contact with the contacts C,C, and into contact with the contacts C C The contacts and switchsprings are mountedon an'insulating block 72.", secured on the bracket71., and reacting between the block and shoulder k on the plunger is acoiled sprin it". When the door is opened the lunger 1s thrust outwardlyby the s ring it re easing the switch sprin s C, C, an per= mitting themby their own elasticity to move against the contacts C, C, therebydisconnecting the branch circuit including the recall bell 6 from theline and connecting the branch circuit containing the generator-20 andthe ringer 23 with the main circuit. When the door 29 is closed theplunger 71. is forced inwardly separating the switch springs C, C, andmoving them a ainst the contacts C, 0 thereby opening t e circuitthrough closing the circuit through the ringer 6. This is the normalcondition of the circuit.

The generator 20, located in each box 25,

: attention to communicating his wants to the central oflice while he isable to operate the magneto without trouble. A special signal isprovided at the central oflice which is are ringers G, one beingassociated with each patrol box circuit, and. such ringer is designedto' control means for actuating a visual signal to notify theo eratorthat'the atrol we on is .desired at t e point to 'whic it is to e sent.This ringer may be 'of any character capable of actuation upon themanipulation o the generator 20, ut is prefera ly of the polarized type,and in the present embodiment of the invention is inserted in the wireI)". The ringer G controls a local circuit in which is included a lam gbefore which is placed a transparency g earing any suitable matterindicating the location of'the is included I rovide a pivoted finger gwhich is norma y supported in inoperative osition-by the tapper g of theringer or a or projecting t erefrom. When the patrolman operates hisgenerator current passes over line21, through the bell 23, wire 24, toone side of the condenser 8, over wire 9, wire 19, line A, connection a,line a, line a relay D,

line (1, battery Y, line b through the polarized ringer G, connection 12line B, line 3, line.

4, contacts 0 C, and C, 0, wire 22 to the return side of the generator,thereby actuatingthe ringer G.- \Vith the firstmovement of the tapper gthe finger g is kicked off and, through the medium of ajcontact g closesthe circuit throughan anvil g; Thecurrent from one side 'of thebatterythen flows throughline g, contact g ,'line g lam 9,

line g, thence to the other side'of the attery, as by a connection withthe line d. This action-lights the lamp 9 and displays the transparencyof the particular circuit operated to inform the operator to what boxnicates with the ofiicer by connecting in with the line his generator Nto ring the bell 23 to notify the otficer that the wagon will be sent orthat it is not in. It will be understood 7 that at this time the outerdoor 29 is open and that therefore the ringer 23 is connected to themain line. The lamp 9 remains lighted until the operator, after the bellG has ceased ringing, moves the fingerg back against the clapper 9 thisaction breaking the contact at g and extinguishing the lamp. The finger9 may "have a lug 9 to enable the op erator to readily restore thefinger and a stop g is preferably providedfor limiting the movement ofthe finger when thrown off by the tapper g.

The polarity of the ringers G issuch that 1 by the current generated bythe generator 20- in the patrol box.

' The recall bell'6 located in each box is designed to attract theattention of the patrolman in'the territory in which the box is located,should it be necessary to communicate with him for anypurpose betweenthe. hours of reporting,for example, to instruct him to report ataparticular place, as in case of a riot or confiagration or for otherreason. This bell is operated .by the ge erator N, having the usualringing indicato n,-in the same manner as. in operating the' ringer 23.When the operator desires to actuate this bell to attract the attentionof an oflicer within audible distance of the box, aringing current isthrown on the line by the operator at central, this ringing currentcoming over line B, line 3, line 4, switch springs O, C,

contacts 0, C, which are closed when the provided with bells of suchsize as to be readily audible for a considerable distance.

' When an officer responds to such call he pens the outer door of thebox, which allows p unger h to be forced outwardly, permitting theswitch s rings C, C, to close against contacts'C, and when the receiveris removed fromthe switch hook 12 he is enabled to talk with centralover the circuit heretofore described. l v

' A jack 9' may be inserted in each circuit at the central station sothat by the use of theusual cord circuits and plugs a patrolman ma anyof'his superior oflicers or with the public system terminating atjackson the board; Such jack 7' may be of any suitable character and islooped in series with the lines a, a, as shown in Fig. 1. v

While I have described with particularit the connections and wiring ofthe system wish'it understood that the details in this respect are notessential and that various modifications may be made'without departingfrom the spirit of my invention; The

switch controlled by the door at the substation is shown and describedwith a pair each of the contacts'and springs, each pair being tiedtogether. This arrangement provides a stronger and more reliableconstruction, but it will be understood that instead of a' pair only oneof each of the contacts and springs is .essential and that with thischange the operations and results would be just the same. i, s

Having described my invention, what I clairnas new and desireto secureby Letters Patent is I l 1. In combination, a telephone system includinga central station and a pluralityof.

substations with individual circuit connect1ons,.'a diagram at thecentral station of the territory in which the substations are located,and a visual signal for each substation on the diagram in thecorresponding location of-each substation, and means at each substationto actuate such si nal,

In a signa ing system, a central station and a plurality of substations,a diagram at the central station of the territory surrounding thesubstations, visual signals at the central station for each substation,one of said signals being associated on the diagram with the location ofthe respective substation for indicating on the diagram theexactlocation from which a signal is sent, and meansat each substation toactuate its associated sig nals at the central station.

,3. In a signaling system, a central station be put in directcommunication with.

switch-board, a

switch-board, a.plu'rality of telephonesubstations, a map on theswitch-board of the territory surrounding the. substations, a

visual signal on the map at a point correspending with the location ofeach substation, a second signal at the central station associated witheach substation, a normally open circuit between each substation and itsasso ciated signals, said signals" being automatically actuated whencalls are made atthe substation. V 4. Ina signalin system,.a.centralstation switch-board, a Iurality of patrol substa-'.

tions, a map on the switchboard of the terri+ tory surrounding thesubstations, individual telephonic circuits between the substationsandthe central station, a lamp on the map at ply current to said lampsupon the removal of the telephone receiver at the ass oclatedsubstation, and an operators key-indicatin signal on the switchboard foreach lamp an actuated simultaneously with the latter.

5. In a signalin system, a central station Iuralit of' patrolsubstations, an indivi ual te ephone circuit between the central officeand each substation and normally openat the latter, .a rela in eachcircuit, a ma on the switchboard o the territory surroun ing thesubstations, lam s on the map at points corresponding with t e locationsof the substations, a normally open local circuit in which each lamp isincluded and which is closed by the relay when the telephone receiver atan. substation is removed from its hook, an a second normally open localcircuit at the switchboard containing 6. In a signalin system, a centralstation switch-boar a p urality of telephone substations on individualcircuits, a relay in each circuit, a substation indicating signal, aseries of operators keys associated with the circuits, an indicatingsignal for each key controlled by the relay of its associated circuit, arelay common to all the circuits, and a signal controlled by the latterrelay. 7. In a signaling system, a plurality of telephonic linesextending from substations to a central'switchboard, signals at theswitchboard associated with the lines, a series of ringing and listeningkeys on the switchs board, each key being in an associated line, asignal at each key, and connections to operate a key-signal when itsline transmits a call-signal.

tery common to a the circuit connections,

a bell and adapted to be closed by the closing of the line circuits.

a point corresponding with the location of a relay in each circuit whichis actuated by the closing of the circuit at the substation, a diagramat the central station of the territory surrounding the substations,signal devices on the diagram'at points corresponding with the locationsof the substations, a local circuit connected with the .battery in whicheach signal device is included and which is closed upon the energizationof the relay, an operators connecting apparatus at the central stationassociated with each circuit, and a lamp indicating the location of suchapparatus and which .is illuminated upon the actuation of the relay.

9. In a signaling system, the combination with a central station and aplurality of patrol substations, of individual metallic circuitconnections between the central ofiice and each substation and normallyopen at the latter, a battery common to all the cir; cuit connections, arelay in each circuit and which is actuated when such circuit is closedat the substation, a map at the central station of the territorysurrounding the substations, incandescent lamps on the ma at the pointscorresponding with the locations of the substations, a local circuitconnected with the battery and in which each lamp is included and whichis closed upon the energization of the relay, an operators ringing andlistenin key associated with each circuit, and a amp indicating thelocation of such key, such amp deriving current from the common batteryand being illuminated upon the actuation of the relay.

10. In a signaling system, the combination with a central stationand aplurality of patrol substations, of ,individual metallic -circuitconnections between the central ofiice and the substations and normallyopen at the latter, a source of current common to all the circuitconnections, a relay in each circuit and which is actuated when suchcircuit is closed at the substation, amap at the central station of theterrito surrounding the substations, incandescent amps on the map at thepoints corresponding with the loca tion of the substations, a localcircuit connated upon the actuation of the relay, a sec- 0nd relaycontrolled by the first relay, and a norm'allyopen local circuitincluding an alarm and a pilot light closed upon the actuation of thesecond relay.

11. In a signaling system, the combination with a central station and aplurality of patrol boxes provided with telephone sets, ofnietalliccircuits connecting the telephone sets'with the central station, asource of energy common to all the circuits, a door to each box, a callbell normally connected with the circuit, a ringer normally disconnectedfrom the circuit, a contact in the line of the call bell circuit, acontact in the cir-, cuitof the ringer, a switch spring, a lungerpressing the switch s ring against t e con-v tact in the call bell newhen the door is closed, and a spring for withdrawing theplungerto'permit the switch spring to en-' gage the contact of the ringercircuit when the door is opened, and means at the central I station foractuating the ringer and bell.

12. In a signaling system,the 'conibination with a central station and aplurality of patrol boxsubst ations, of metallic circuits connecting thecentral station and the substations and provided -ith telephone sets atthe substations and normally open at the snitch-hook, a source of energycommon to all the circuits, a normally closed branch circuit at eachsubstation, a bell in such circuit, a second branch circuit providedwith a ringer, a switch spring for opening andcloslng the branchcircuits 1n alternation, a

plunger mounted on the box and engaged bv the ,door when closed to closethe call bell branchcircuit, and a spring for thrusting the plungeroutwardly to break the call bell branch circuit and close the ringerbranch circuitr. hen the door is opened.

13. In combination a ith a central energy telephone system comprising acentral station and a plurality of substations v. ith in-' dividualcircuit connections, a current gen-- erator at each substation, a signalat'central for each line and operated by the removal of the associatedreceiver, and a signal at central in a 'normallyopen local c1rcu1tderiving current from the central source of energy "and closed upon theactuation of ,the associated substation generator.

14. In a telephone signaling system, the

signal is included and deriving current from,

the said common source, and means at the central station actuated hen asubstation alternatin current generator is operated to close the localcircuit to operate the visual signal of such substation.

15. In a signalin system, in combination, a central energy tdlephonesystem comprismg a central statlon and a plurality of substations withindividual circuit connections and a current generator common to all thecircuits, a polarized ringer in each circuit closer actuated by thepolarized ringer for closing the local circuit.

16. In a signaling system, in combination, a central station and aplurality of substations, circuits connecting the central station andthe substations and provided with alternating current generators at thelatter, a source of current common to all the circuits, a visual signalassociated with each circuit and included ina local circuit at thecentral station connected with the common sourceof current, an audiblesignal in the main circuit and u hich is operated by the alternatincurrent generator at the substation, and means controlled by the audiblesignal for closing the local circuit.

17. In a signaling system, in combination, a central station and aplurality of substations, circuits connecting the central station andthe substations and each of which is provided with an alternatingcurrent generator, a source of current common to all the circuits, alamp at the central station associated with each circuit and providedwith a.

transparency indicating the location of the substation, a local circuitin which such lamp is included, a ringer in the main circuit andresponding only upon the actuation of the alternating current generat orat the substation, and a pivoted contact normally supported by thetapper of the ringer and which upon the actuation of the ringer is movedto close the local circuit.

18. In a police telephone signaling system, in combination, a centralstation and a plu rality of substations, circuits connecting the centralstation and the substations and normally open at the substations,telephone sets in the circuits at the substations, a normally closedbranch circuit at the substation provided with a call bell, a secondnormally open branch circuit at the substation prov ded with a ringer,means for connecting and disconnecting the branch circuits to and fromthe main circuit in alternation, a rela in the circuit at the centralstation and whic is actuated upon the closin of the circuit at thesubstation, a signal at the central station indicating the location ofthe substation and included in a normally open local circuit, an

'operators telephone set at the. centralrstation, keys for connectingthe telephone set with the circuit, a lamp associated with each key andincluded in a local circuit which is closed upon the energization of therelay, and a battery common to all the main and local circuits.

19. In a police telephone signaling system, combination, a centralstation and a plurality of substations, circuits connecting the centralstation and the substations and normally open at the latter, telephonesets in the circuits at the substations, a branch circuit at eachsubstation, a call bell in such branch 7 circuit, a second branchcircuit at each substation, an alternating current generatorv and aringer in the second branch circuit, a switch at each substation forconnecting and disconnecting the branch circuits to and vfrom the maincircuit in alternation, a battery at the central station common to allthe circuits, amap at the central station of the territory in which thesubstations are located, a lamp on the map at a point corresponding tothe location of each substation, a local circuit in which such lamp isincluded, a relay in the main circuit for opening and closing the localcircuit, an operators tele phone set at the central station, keys forconnecting and disconnecting the operator's telephone set with the linecircuits, a lamp associated with each line circuit and indicating thekey associated with such circuit, a local circuit including an alarm anda pilot light, a second relay controlled by the first relay'for closingthe alarm circuit, and'a current generator at the central station foractuating the bell and ringer at the substations.

20.- In a police telephone signaling system, in combination, a centralstation and a plurality of substations, circuits connecting the centralstation and the substations and normally open at the latter, telephonesets in the circuits at the substations, a branch circuit at eachsubstation, a call bell in such branch circuit, a second branch circuitat each substation, an alternating current generator and a ringer in thesecond branch circuit, a switch at each substation-for connecting anddisconnecting the branch circuits to and from the main circuit inalternation, a battery at the central station common to all thecircuits, a map at the central station of the territory in which thesubstations are located, a lamp on the map at a point correspondingtothe location of each substation, alocal circuit in which such lampisincluded, a relayin the main circuit for opening and closing the localcircuit, an operators telephone Set at the central station, keys forconnecting and disconnecting the operators telephone set with the linecircuits, a lamp associated with each line circuit and indicating thekey associated with such circuit, a local circuit including an alarm anda pilot light, asecond relay controlled by the first relay for closingthe alarm circuit, a current generator at the central stationfor'actuating the bell and ringer at the substations, a trans arency atthe central station associated with each line circuit and indicating thelocation of the substation with which operation of the audible signalforclosing the a such transparency is associated, a lamp for transparencylamp local circuit. V 7 1c illuminating the transparency and included Intestimony whereof I afix my signature in a normally 0 en local-circuit,an audible I in presence of two Witnesses.

5 signal at the su stat-ion included in the line i v N. BANKS QREGIER.

circuit and actuated only upon the operation Witnessesi of the currentgenerator at the substation on ARTHUR B. Snmotm.

such circuit and a contact actuated upon the J. MoRoBER'rs.

